X = int(input())
print("Yes" if X >= 30 else "No") X = int(input()) X int(input()) int input() input print("Yes" if X >= 30 else "No") print "Yes" if X >= 30 else "No" X >= 30 X 30 "Yes" "No" X = int(input()) int(input()) X
X = int(input())
print("Yes" if X >= 30 else "No")
